package edu.lambdateacher.awt;

/*
LambdaTeacher
Copyright (C) 2000  Kim Mason
Copyright (C) 2014  Vitalij Zadneprovskij

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
*/

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import edu.lambdateacher.expressions.Expression;

public class AnyReduceBtnActionListener implements ActionListener{
	
	AWTUserInterface awtUserInterface;
	
	public AnyReduceBtnActionListener(AWTUserInterface awtInterface){
		awtUserInterface=awtInterface;
	}
	
	public void actionPerformed(ActionEvent e) {
		if (awtUserInterface.getTheexpr() != null) {
			ExpressionChooser thechooser = new ExpressionChooser(awtUserInterface.getTheexpr(),
					awtUserInterface);
			thechooser.setVisible(true);
			Expression toreduce = thechooser.getExpr();

			awtUserInterface.setTheexpr(awtUserInterface.getTheexpr().reduceExpression(toreduce));
		}

		String lambdastring = null;
		if (awtUserInterface.getTheexpr() != null) {
			lambdastring = awtUserInterface.getTheexpr().stringRepresentation(false);
		}
		if (lambdastring != null) {
			awtUserInterface.exprdisplay.setText(lambdastring);
		} else {
			awtUserInterface.exprdisplay.setText("");
		}
	}
}
